New York's ground zero through time

One World Trade Center is officially open for business. Take a look at the World Trade Center site through time, from the construction of the Twin Towers to the opening of the new centerpiece on the site.

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Andrew Serban/Getty Images

A wreath, a picture and scrawled messages in honor of those who perished are part of a memorial to the victims of the Sept. 11, 2001, terror attack at a viewing platform Jan. 26, 2002, at Ground Zero in New York City.

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